Considered one of the greatest tactical achievements of the southern insurgency during the American War, the Cu Chi Tunnels spiderweb beneath miles of rice paddies and fertile farmland all the way from Ho Chi Minh City to the Cambodian border.

The distinct geological feature of the Signal Hill National Historic Site rises high above the Narrows, at the mouth of St. John’s Harbour. It offers stunning views across the city, down the coast, and out into the Atlantic Ocean.

From September 1940 to May 1941, Britain and its population had to endure sustained bombing by the Germans—an event that is referred to as “the Blitz” (German for “lightning”). In town, you can still see the scars of where the bombs fell, knocking out a few houses in a terrace of older properties.

The so-called Roosevelt Corollary was used to justify troop deployment to Latin America, and President William Howard Taft provided further rationalization for aggressively dominating Latin America with his Dollar Diplomacy, an unabashed strategy to advance and protect U.S. businesses. Nicaragua, which had been host to U.S. fruit, mining, and transportation interests since the 1850s, was a frequent recipient of such foreign policy. The following is a detailed list of interventions in Nicaragua.

Heredia, seven miles north of San José and colloquially known as La Ciudad de las Flores (City of Flowers), is surrounded by coffee fields. A pleasant atmosphere pervades the grid-patterned town despite its jostling traffic, making it easy to wander. There’s something here for history buffs, coffee aficionados, nature lovers, and after all that, the nightlife is pretty good too.

From the early 19th century through the end of the Vietnamese monarchy in 1945, Hue’s Imperial City housed an impressive cache of temples, palaces, and administrative buildings. Of the 148 buildings in the walled Citadel complex, today 20 remain. Wide, opulent palaces and dimly lit temples pepper the now-overgrown grounds, boasting a mix of traditional Vietnamese architecture, vibrant lacquered woodwork, and ornate rooftops, not to mention 143 years’ worth of imperial history.

Although not indigenous to Puerto Rico, the Paso Fino horse is closely associated with the island because it was here and in the Dominican Republic where the Spanish conquistadors first introduced the mixed-breed horse. The Paso Fino are superb saddle horses thanks to their unusual gait, high level of endurance, great agility, and remarkable obedience.

From the overgrown ruins of a sugar mill to a restored 19th century Spanish fort to an incredible bioluminescent bay, there’s plenty to see on Vieques–and most you can do for free. Here are the most interesting sights to see, along with the island’s best beaches for a break between all the activity.